- 學位論文
空調送風機熱交換性能分析
Performance analysis of Fan-Coil Unit heat exchanger
摘要
近年來由於各式能源價格價格不斷往上飆漲，就台灣而言冷氣空調部份就是屬於高耗電量產品，而進出水高溫差已是冰水系統的趨勢許多文獻提到大溫差可以大幅降低流量減少泵浦的耗電，在低流量下空調產品的熱交換器如何設計就變的十分重要。本研究希望能將室內冷氣所使用的空調送風機設備，藉由改變其熱交換器冰水迴路配置實驗，以增加溫度分佈的均勻性，進而能提升熱交換器性能，增加整體空調送風機氣側方面及降低耗電等相關能力。 本研究主要分為兩個部份。第一部份是在相同的熱交換器銅管分流支數相同的情形下，量測三種不同冰水迴路配置的熱交換器，實驗採用ARI高溫差標準條件控制溫濕度及冰水進、出水溫度在相同的情況下，比較實驗量測的結果。經實驗結果發現，管路配置為Counter Flow型式的熱交換器其進風與經過熱交換器後的出風溫差加大表示焓值越大所以其氣側能力最佳，相較於效能最差的平行A-Type，送風機氣側能力可以提升30%。 第二個部份則延續探討第上述部分的三種不同迴路配置的熱交換器，改變其冰水進入熱交換器位置之實驗，研究空調送風機熱交換器會有何種影響。經實驗結果D、E型式Type熱交換器進出水位置對調時，氣側能力較沒對調前有6％的差異。然而差異最大的就是F-Type型式，經對調進出水位置後原本銅管內與風向原本是逆向流方式就完全變成順相流方式，使F-Type的熱交換能力降低出風溫度較原本逆相流的C-Type上升使得進出風焓差變小氣能側能力下降40％。因此本研究希望藉此找出送風機熱交換器最佳化的迴路配置，並藉由實驗對熱交換器進行迴路配置驗證，以便可以設計出高效能之熱交換器。
並列摘要
Prices of all kinds of energies have been rapidly rising in recent years. In Taiwan the air conditioner is regarded as a product with high power consumption, and the chilled water system with high temperature difference has become a trend. It has been addressed in numerous literatures that high temperature difference can lead to significant reduction of flow volume thus reducing the power consumption by the pump. This is why the design of heat exchanger has become extremely important for air conditioner products under low flow volume. In this study the chilled water loop configuration of heat exchanger of indoor air conditioner blower will be changed in order to improve the uniformity of temperature distribution, enhance the performance of heat exchanger, improve the capacity of air blower side of the entire air conditioner, and reduce power consumption. This study is divided into two parts. The first part is to measure the heat exchangers with three different chilled water loop configurations yet same number of brass pipes. In this experiment the ARI high temperature difference standard conditions will be used to compare the measurement results under identical temperature, humidity, and the temperatures of incoming and outgoing chilled water. The experimental results indicate that the temperature difference between incoming and outgoing air of heat exchanger with Counter Flow type piping configuration has been increased thus indicating higher enthalpy and better air side capacity. Compared to parallel A-Type of which has the worst capacity, the air side capacity of the Counter Flow blower can be enhanced by 30%. The second part of this study is to further investigate the aforementioned heat exchangers with three different loop configurations by changing the location of entrance of chilled water into the heat exchanger to see how it affects the heat exchanger of air conditioner blower. Based on the experimental results, there is a 6% difference in air side capacities of D and E Type heat exchangers after switching the locations of water inlet/outlet. However, the biggest difference takes place in the F-Type, where the air flow direction within the brass pipe will be changed from reverse flow to forward flow after switching the locations of water inlet and outlet, thus leading to reduced capacity of F-Type heat exchanger. The temperature of outgoing air is higher than the C-Type with original reverse flow such that the enthalpy difference of incoming/outgoing air has been reduced, and the air side capacity has dropped by 40%. Therefore, the purpose of this study is to figure out the optimal loop configuration for air blower heat exchangers based on experimental verification in order to design highly efficient heat exchangers.